Protection from Arrows

This spell may be cast by a wizard of at least 5th level. Next time you punch, a hit creature (you hit yourself if no one else is hit) takes 10 less damage from all arrows or similar projectiles. Arrows made of null iron penetrate the spell. Once 100 damage is negated (a null iron arrow counts as damage negated, even though it penetrates) by the spell, Protection from Arrows ends.